摘要
依托位于孟加拉湾入海口的某大直径盾构隧道,基于有限的水文基础资料,得到合理的入海口深厚淤积地层冲刷深度。首先根据经验及分析确定糙率、流量等参数,通过数值模拟计算不同径流与潮水组合工况下的河床冲刷,同时每个工况分别考虑了饱和带沙和清水两种条件,得到了冲刷深度的包络线;然后对比分析了基于多种规范要求的满足抗浮的最小覆土厚度,探讨满足掘进稳定性要求的最小覆土厚度;最后结合冲刷的研究成果,建立了该工程隧道全线纵断面合理覆土厚度的确定方案。
A large-diameter shield tunnel is located at the estuary of the bay of Bengal in deep sedimentary stratum,which is scoured by the effect of both runoff and tide.The lack of basic hydrological data in the local area and the lack of technical support for the study of riverbed erosion and siltation have brought great challenges to the study of the reasonable orerburden thickness of the tunnel.In order to reasonably obtain the scouring depth of the deep sedimentary strata at the estuary based on limited data,parameters such as roughness and flow rate were reasonably determined based on experience and analysis,and the scour depth under different combined conditions of runoff and tidal water were calculated through numerical simulation,and additionally two conditions of saturated sand and clear water were considered for each working condition.Based on the calculation results of each working condition,the envelope of the scour depth was obtained.The minimum overburden thickness for anti-floating based on the requirements of various specifications was compared and analyzed,and the minimum overburden requirements for excavation stability were discussed.Finally,combined with the research results of scouring,a scheme for determining the reasonable overburden thickness of the entire longitudinal section of the tunnel was established.
作者
李金
舒恒
周建银
柴朝晖
LI Jin;SHU Heng;ZHOU Jianyin;CHAI Chaohui(CCCC Second Highway Consultants Co.Ltd.,Wuhan 430056;CCCC Research and Development Center on Tunnel and Underground Space Technology,Wuhan 430056;Changjiang River Scientific Research Institute,Wuhan 430056)
出处
《现代隧道技术》
CSCD
北大核心
2022年第S01期203-211,共9页
Modern Tunnelling Technology
关键词
盾构隧道
深厚淤积层
冲刷深度
合理覆土厚度
Shield tunnel
Rational overburden thickness
Deep sedimentary stratum
Runoff and tide
Scour depth
作者简介
李金(1986-),男,硕士,高级工程师,主要从事隧道与地下工程技术研究及设计工作,E-mail:799370649@qq.com.
